APIs allow others to fetch data
Like Google map API, Twitter API, Facebook API, Reddit API, etc.
Interface for the code to talk to each other.
It can be a db api, a hard drive api to connect, or any other.
Web API is a subset of APIs.
Huge list of API collections which updates when you update one https://ifttt.com/ & https://www.programmableweb.com/category/all/apis
Serving Data:
Data can be served in the form of JSON, XML, URL encoded string or text format.
Package to use for Node APIs:
Satyanarayan Mishra 
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